Sliding abutment unit for rotary displacement pumps or motors



1947- f Y H JEFFRIES 2,425,244

7 v SLIDING ABUTMENT UNIT FOR ROTARY DISPLACEMENI PUMPS OR MOTORS Filed Aug; 12, 1945 4 Sheets-Sheet 1 lm/entar Aug. 5, 1947.

H. JEFFRIES 2,425,244

SLIDING ABUTMENT UNIT FOR, ROTARY DISPLACEMENT PUMPS'OR MOTORS Filed Aug. 12, 1943 I 4 Sheets-Sheet 2 Inventor J gfrzas WWW Aug. 5,1947. H. JEFFRIES 2,425,244

SLIDING ABUTMENT UNIT FOR ROTARY DISPLACEMENT PUMPS OR MOTORS V a '74 N Z1 Z5 y]: I

' W WEM F Aug. 5, 1947. H. JEFFRIES 2,425,244

SLIDING ABUTMENT UNIT FOR ROTARY DISPLACEMENT PUMPS 0R MOTORS Filed Aug. 12, 1945 4 Sheets-Sheet 4 Inventor Patented Aug. 5, 1947 5 IPA-TENT omen SLIDING ABUTMENT UNIT FOR/ROTARY DISPLACEMENT PUIWPS OR MOTORS I Hugh Jeffries, Santa Monica, Calif Application August 12, 1943, Serial Nor 198,372

My invention relates to improvements in sliding abutment units for rotary displacement pumps, or motors, the principal object in view being to provide an efficient mechanical unit designed for the purpose of converting and transmitting rotary power hydraulically.

Another object of the present invention is to provide a unit of the character stated wherein the volume of fluid in the system in which the unit is installed is constant and under positive confinement.

Another important object of the invention is to provide a unit of thecharacter stated which when installed in a hydraulic system will promote the flow of fluid in the system at a constant rate regardless of the speed of flow.

Other objects and advantages of the invention will become apparent to the reader of the following description.

In the drawings:

Figure 1 is a side elevational view of the unit.

Figure 2 is a transverse section on the line 2--2 of Figure 1.

Figure 3 is a perspective view of one of the sliding abutments.

Figure 4 is a section on the line 44 of Figure 2.

Figure 5 is a vertical sectional view through a slightly modified form of the invention showing a slightly modified form of sliding abutment.

Figure 6 is a top plan View of the structure shown in Figure 5.

Referring to the drawings wherein like numerals designate like parts, it can be seen that numeral 5 generally refers to a stator which consists of an annulus 6 having a base 1 and side walls 8, 9, from which rise plates II] which define end walls for a vertical block formation H on the annulus 6.

A partition I2 is provided between the side walls 8, 9 and this at its upper end also has a portion l3 rising to the top level of the plates I and this carries an inverted U-shaped conduit M, the leg portions of which define cylinders l5, IS in which operate pistons l6, IE on a pair of abutments l1, [8. At this point, it can be seen that the plate formations ID on the side walls 8, 9 are secured by machine screws [9 to the block H.

The abutments l1, l8 are constructed as substantially shown in Figure 3, each consisting of the gate portion 20 and a riser 2| extending upwardly therefrom and carrying the piston l6, and a pair of guide legs 22, 22 which move in guideways 23, 23 at opposite sides of the corresponding cylinder I of the conduit [4.

Numeral 24 denotes a rotor located within the stator and this of the two-part construction consisting of a rotor element 25 operative in the chamber at one side of the partition I 2 and a 2 Claims. (01. 103423) rotor element 26. operative in the chamberat the opposite side of the partition [3. These rotor elements may be individual and splined as at 21 to the shaft 28, or they may be integral.

It can be seen, that the rotors are substantially circular, but eccentrically mounted on the shaft 28 so that the peripheral portion thereof furthest removed from the shaft 28 constantly wipes the inside of the stator 6. Further, the elements'25, 26 of the rotor are oppositely disposed, in other words, when the rotor element 26 has forced its sliding abutment toits uppermost position, the sliding abutment in the other compartment is at its lowermost position, and this is clearly shown in Figure 2.

A small cylinder 30 rises from the conduit l4 and has a cap 3| through which a screw 32 is feedable and this screw has a piston 33 on its lower end. Obviously, this serves to take up any lost motion in the movement of the fluid 34 in the conduit M.

The unit is installed in a system, numeral 34 denoting a return pipe, while numera1 35 denotes a distribution pipe. The return pipe 34 has branch pipes 36 which are secured as at 31 to the side walls 8, 9 and communicates with intake openings 38 at one side of each of the sliding abutments l1, l8, while the distribution pipe 35 has branch pipes 39 which are secured as at 40 to the side walls 8, 9 over outlet openings 4| at the remaining sides of the sliding abutments l1 and [8,

The action of the gates I1, I8 is reciprocal. In following the contour of an element of the rotor, one gate valve is caused to rise while the other gate is correspondingly forced downwardly, following the contour of the companion rotor element, and this is accomplished by means of the fluid confined in the synchronizing conduit l4.

Obviously, in the operation of the unit the same is reversible with rotary power applied to the axle, it is a pump. With fluid supplied as a pressure it is a motor. In operation the fluid enters the ports 38 and is forced around in the corresponding chamber of the stator, by the corresponding rotor element, to the outlet openings 4|, and this action on the fluid is constant and not intermittent.

As will be discerned from an examination of the drawings, particularly Figures 4 and 5, the rotors are not only eccentrically mounted in the stator, but are arranged with respect to each other so that their greatest radial measurements are located in opposite directions, this having the effect that for the entire peripheries of these rotors the displacement is exactly complementary and equal to the displacement constant for which the unit is designed.

A slightly modified form of gate is shown in Figure 5, wherein the reference character 5a arm 50 pivotally mounted in a conduit Ila inwhich is a volume of fluidand whichiunctiqns substantially as does the conduit M 2118 fluid 34 therein in the form of the inyention shown in Figure 2.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from theispiritiand scope zof'the inuentionla c1aimed hereinafter.

being --eccentrically mounted .-on :the shaft and having their greatest radial measurements L- cated in opposite direction, :a; slidingabutmentin each of the A chambers ihaving. continuous Lcontact *with the periphery of its respective .rotor element, each chamber having an inleteportat. one side of its sliding abutmentiand an outlet .port at the -opposite side :of its sliding abutment and equalizing mean-s consisting of anarched -conduit containing a volume of fluid :and having opposite -ends extending into said chambers, and

a piston on each of the sliding abutments opera- 'tive-in' one end of the conduit.

12. 1A hydraulic unit of thecharacter described comprising a stator, a -rotor mountedin -thestator, a partition in said stator dividing gthe-same into 'a-pair of chambers said'rotor I being divided into a pair of rotor elements, a shaft, said rotor elements being eccentrically mounted on the shaft and having their greatest radial measurements located :in opposite direction, a sliding abutment in each of the chambers with which the periphery of one of the rotor elements is operatively engaged, each chamber having an inlet-portal: one side of its sliding abutment and an outlet port at the opposite side of its sliding abutment, and equalizing means consisting of a vertical U-shaped conduit straddling said partition ,with .ends opening into said chambers, said conduit containing a volume of fluid, and a pistonon each of the sliding abutments operative in the corresponding end of the conduit, each of udil din abutmentsibeing.proyidedmithapair .of .guide zlegs ,upon opposite sides of the li iston :th reof, sa d stator .fb ing provided with guiderwaysforsaid uidele s.

QEEEEENQW EQ EEED I he fo1lowi-ng references are of record in the f le or --thi s -patent: UNITED STATES PATEN :I;s

Number Name Date 16,875 Griswold -Mar. 24, 11857 lie-4,294 :Lambetal 1Dec. 24, 1872 .30 951,762 -Kin-ney Mar. 8, 1910 1,827,088 Jaworowski Qct. 13, 1931 642 005 Robinson -et a1 J an. 23,1900 817,472 :Decor -Apr.-l0,:1906 883,319 Leask 'Ma.r,:31, 1908 1,611,434' Graham -Dec.=21, 1926 13840,!)53 Hoffman Jan. 12,1932 1,894,055 Perkins Jan.;;10, 193 3 FOREIGN AW-S Number Country Date 1679 (Great Britain -.Apr..15, 1901 

